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Finding the cause for infeasibilities or counter-intuitive results
in large-scale numerical models is not trivial.
For this reason, the MESSAGEix framework includes a number of
features to simplify debugging and pre-processing data validation.

The MESSAGEix framework includes the option to “relax” the most common constraints,
simultaneously adding a penalty term for the relaxation to the objective function.
Solving the relaxed version of the model can help to identify incompatible constraints
or input data errors causing infeasible models.

The relaxations can be activated by blocks/types of equations
by setting the respective global variables ($SETGLOBAL in GAMS)
in MESSAGE_master.gms or by calling MESSAGE_run.gms passing the
global variables as command-line arguments.